Q: A : Budgetery allocation for building a better railway network, eg constructing new railway lines, has increased B : There has been a substantial drop in the number of passengers opting for air travel

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  If statement (A) is the cause and statement (
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  is its effect B) If statement (B) is the cause and statement (A) is its effect
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  If both the statements (A) and (B) are independent causes
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  A) is the cause and statement (B) is its effect B) If statement (B) is the cause and statement (A) is its effect C) If both the statements (A) and (B) are independent causes D)